// script.aculo.us builder.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

var Builder = {
	NODEMAP: {
		AREA: 'map',
		CAPTION: 'table',
		COL: 'table',
		COLGROUP: 'table',
		LEGEND: 'fieldset',
		OPTGROUP: 'select',
		OPTION: 'select',
		PARAM: 'object',
		TBODY: 'table',
		TD: 'table',
		TFOOT: 'table',
		TH: 'table',
		THEAD: 'table',
		TR: 'table'
	},
	// note: For Firefox < 1.5, OPTION and OPTGROUP tags are currently broken,
	//       due to a Firefox bug
	node: function( elementName )
	{
		elementName = elementName.toUpperCase();
    
    // try innerHTML approach
		var parentTag = this.NODEMAP[elementName] || 'div';
		var parentElement = document.createElement(parentTag);
		try
		{ // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
			parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";
		}
		catch(e)
		{
		}
		var element = parentElement.firstChild || null;
      
    // see if browser added wrapping tags
		if (element && (element.tagName.toUpperCase() != elementName))
			element = element.getElementsByTagName(elementName)[0];
    
    // fallback to createElement approach
		if (!element) element = document.createElement(elementName);
    
    // abort if nothing could be created
		if (!element) return;

    // attributes (or text)
		if (arguments[1])
			if (this._isStringOrNumber(arguments[1]) ||
				(arguments[1] instanceof Array) ||
				arguments[1].tagName)
			{
				this._children(element, arguments[1]);
			}
			else
			{
				var attrs = this._attributes(arguments[1]);
				if (attrs.length)
				{
					try
					{ // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
						parentElement.innerHTML = "<" + elementName + " " +
												  attrs + "></" + elementName + ">";
					}
					catch(e)
					{
					}
					element = parentElement.firstChild || null;
            // workaround firefox 1.0.X bug
					if (!element)
					{
						element = document.createElement(elementName);
						for (attr in arguments[1])
							element[attr == 'class' ? 'className' : attr] = arguments[1][attr];
					}
					if (element.tagName.toUpperCase() != elementName)
						element = parentElement.getElementsByTagName(elementName)[0];
				}
			}

    // text, or array of children
		if (arguments[2])
			this._children(element, arguments[2]);

		return element;
	},
	_text: function( text )
	{
		return document.createTextNode(text);
	},

	ATTR_MAP: {
		'className': 'class',
		'htmlFor': 'for'
	},

	_attributes: function( attributes )
	{
		var attrs = [];
		for (attribute in attributes)
			attrs.push((attribute in this.ATTR_MAP ? this.ATTR_MAP[attribute] : attribute) +
					   '="' + attributes[attribute].toString().escapeHTML().gsub(/"/, '&quot;') + '"');
		return attrs.join(" ");
	},
	_children: function( element, children )
	{
		if (children.tagName)
		{
			element.appendChild(children);
			return;
		}
		if (typeof children == 'object')
		{ // array can hold nodes and text
			children.flatten().each(function( e )
			{
				if (typeof e == 'object')
					element.appendChild(e)
				else
					if (Builder._isStringOrNumber(e))
						element.appendChild(Builder._text(e));
			});
		}
		else
			if (Builder._isStringOrNumber(children))
				element.appendChild(Builder._text(children));
	},
	_isStringOrNumber: function( param )
	{
		return(typeof param == 'string' || typeof param == 'number');
	},
	build: function( html )
	{
		var element = this.node('div');
		$(element).update(html.strip());
		return element.down();
	},
	dump: function( scope )
	{
		if (typeof scope != 'object' && typeof scope != 'function') scope = window; //global scope

		var tags = ("A ABBR ACRONYM ADDRESS APPLET AREA B BASE BASEFONT BDO BIG BLOCKQUOTE BODY " +
					"BR BUTTON CAPTION CENTER CITE CODE COL COLGROUP DD DEL DFN DIR DIV DL DT EM FIELDSET " +
					"FONT FORM FRAME FRAMESET H1 H2 H3 H4 H5 H6 HEAD HR HTML I IFRAME IMG INPUT INS ISINDEX " +
					"KBD LABEL LEGEND LI LINK MAP MENU META NOFRAMES NOSCRIPT OBJECT OL OPTGROUP OPTION P " +
					"PARAM PRE Q S SAMP SCRIPT SELECT SMALL SPAN STRIKE STRONG STYLE SUB SUP TABLE TBODY TD " +
					"TEXTAREA TFOOT TH THEAD TITLE TR TT U UL VAR").split(/\s+/);

		tags.each(function( tag )
		{
			scope[tag] = function()
			{
				return Builder.node.apply(Builder, [tag].concat($A(arguments)));
			}
		});
	}
}
